In a baking pan approximately 13 x 9 x 2 inches, spread ½ cup of tomato sauce on bottom. Layer the lasagna ingredients as follows: Arrange three strips of lasagna noodles on the bottom. Spread half of the cheese mixture on noodles, then half of the vegetable mixture, and 1 cup of the tomato sauce. Repeat, starting from the noodles. End with a layer of noodles topped with the remaining ½ cup of tomato sauce. Sprinkle the top of the lasagna with additional Parmesan, if desired.

Bake the lasagna at 375 for 25 minutes. Let it stand for about 10 minutes before serving it.